This volume contains a selection of papers on grammaticalization from a broad perspective. Some of the papers focus on basic concepts in grammaticalization research such as the concept of 'grammar' as the endpoint of grammaticalization processes, erosion, (uni)directionality, the relation between grammaticalization and constructions, subjectification, and the relation between grammaticalization and analogy. Other papers shed a critical light on grammaticalization as an explanatory parameter in language change. New case studies of micro-processes of grammaticalization complete the selection. The empirical evidence for (and against) grammaticalization comes from diverse domains: subject control, clitics, reciprocal markers, pronouns and agreement markers, gender markers, auxiliaries, aspectual categories, intensifying adjectives and determiners, and pragmatic markers. The languages covered include English and its varieties, German, Dutch, Italian, Spanish, French, Slavonic languages, and Turkish.